cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A280377 Partial sums of A119619.

Original entry on oeis.org

1, 2, 4, 7, 31, 41, 761, 1076, 5556, 10092, 3638892, 3650442, 482652042, 496551642, 539602650, 1178115525, 20923968003525, 20925873907525, 6423299579635525, 6423418373678893, 6491526825518893, 11027299390478893, 1124011755076998158893, 1124011800169644507643
Offset: 1

Views

Author

Jaroslav Krizek, Jan 07 2017

Keywords

Comments

A119619(n) = Product_{d|n} pxi(d), where pxi(m) is the product of totatives of m (A001783).

Crossrefs

Cf. A119619, A280378.

Programs

  • Magma
    [&+[&*[&*[h: h in [1..d] | GCD(h,d) eq 1]: d in Divisors(k)]: k in [1..n]]: n in [1..100]]

Formula

a(n) = Sum_{i=1..n} A119619(i).
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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